First make sure that it has plenty of good clean fuel. Old fuel will cause spark knock.
SOURCE: v-6 engine noise
You could have a worn serpentine belt, and or bad idler pully bearing or a bad serpentine belt tensioner. With that anount of miles and years in the truck, it wouldn't hurt to change all. A good thing to check if it is the belt is to spray some water on the belt while the engine is running. If the noise goes away then it's your belt and while the belt is off, it's a good time to check the pully bearings.
Good luck and hope this helps.
SOURCE: Engine taps when accelerating, let off gas and it
HOPE IT'S NOT PISTON SLAP, IF LACK OF MAINTANENCE WAS THE CASE MAY BE INTERNAL DAMAGE OR VALVETRAIN DAMAGE. IF IT RUNS ROUGH MAYBE SOMETHING ON ROTATING ASSY DAMAGED.
SOURCE: Loud Ticking sound 2004 F150
Check the Alternator / Powersteering belts .
One of them will be damaged and loose.
Hope this helps.
SOURCE: 2005 Diesel F-350 turn over but will not start
check heating module, follow wires from heating plugs and you will come to it hope this helps?
Testimonial: "thank you for your input, i will try that & post back. mechanicly uninclined to an extent so i appeciate your time. SF-SoCal"
SOURCE: my 1989 ford truck 300 6cyl eng idles but will not
if you have fuel injection then it could be a injector/s is/are bad if this happend al at once then it could be that its a sensor bad like the TPS (on gm) throdle posistion sensor the only way to determan whats going on is to have it hooked up and tested to see whats going on if you can get it to auto zone or advanced auto parts they can check for free if you have one around your area call around the small shops in your area and ask what it would cost to have it hooked up to find the problem
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